A practical physics manual

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...support for oven if Bunsen burner is used; mercury thermometer reading to 5ooF., small gas oven fitted with an oven thermometer. An oven thermometer costing $1 can be obtained from the Cooper Oven Thermometer Co., Pequabuck, Conn. By means of a metal drill an opening can be made in the side of a gas oven and the oven thermometer attached. If the oven has a glass or mica door a mercury thermometer may be supported on an iron grate with the bulb near the center of the oven and readings taken through the door. If the oven door is iron it will be necessary to drill through the top of the oven for the insertion of the mercury thermometer. The thermometer should then be inserted so that the stem from about 2500 up is above the top of the oven. Asbestos paper should then be packed around the thermometer at the opening in the oven. COOKING TEMPERATURES What to do: (a) Arrange cups and materials for application of heat as follows: (1) Boiler containing water; (2) double boiler (copper dipper of apparatus A inserted through the top), both parts containing water; (3) covered "steamer"--apparatus A with thermometer tube screwed on top; (4) beaker or test-tube containing sirup made of equal parts (by weight) of sugar and water; (5) beaker or pan of fat (lard, tallow, cottolene, or crisco); (6) fireless cooker containing pail or kettle full of boiling water; (7) oven; (8) salt brine. (b) Heat each vessel (except fireless cooker) not less than 15 minutes, or long enough to satisfy yourself that you have characteristic values. (c) Tabulate results as follows: Liquids showing constant temperature after boiling point is reached Liquids showing constant rise of temperature during heating Instance of falling temperature Instances of high-cooking temperatures (above b...